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What is this growing only oak tree

There is a grapefruit size yellow ball that is growing in a hole on my oak tree . what is it ??

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1 Comment To "What is this growing only oak tree"

#1 Comment By Downtoearthdigs On 05/18/2018 @ 3:06 pm

This is a fungus of some type. Some fungus can be of no concern, though it can be symptom of bigger problems.

You may want to have the tree examined by a qualified Arborist.

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